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Discover Ludwig"I guarantee" is correct and usable in written English
You can use it to express certainty or assurance that something is true or a promise that you will fulfill something. For example: "I guarantee I will have the report to you by Friday."
Exact(60)
I guarantee three hours.
"I guarantee you that".
I guarantee it".
"I guarantee it," he said.
I guarantee they will.
I guarantee that.
I guarantee they'll move".
"I guarantee you'll be a mess".
I guarantee it," into popular culture.
"I guarantee you might win," he promised.
"I guarantee you they were thinking it".
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com